MDFUE 8.50 (Setpoint for Air Mass from Load Torque)

From Nefmoto

The torque variable milsol_w, which is set on the charge path at the basic ignition angle and basic efficiency is converted into torque variable misopl1_w, which corresponds
to the optimum torque at lambda = 1. The map KFMIRL provides the cylinder charge which corresponds to this operating point.

This cylinder charge is limited to a minimum permitted value rlmin_w at which the condition B_mdmin is set for idle control which then stops the integrator. In the case of a turbocharger, there is a limit on the maximum permitted cylinder charge rlmax_w. This variable does not exist for naturally-aspirated engines!

The map KFMIRL is the inverse of map KFMIOP in the function MDBAS (it is understood that this is not a direct arithmetic inverse, but is intended to mean that the variables on the x, y & z axes are complementary). See MDBAS for application notes.

Parameter

Description

CWRLAPPL

Code word:
default rlsol_w during applications phase

FRLMNHO

Correction
factor for rlmin via altitude

FWPEDRLS

Factor for
direct entry to the default rlsol from wped (application)

KFMIRL

Map for
calculating target cylinder charge

KFRLMN

Minimum
cylinder charge in firing mode

KFRLMNSA

Minimum rl
during overrun fuel cut-off

RLSOLAP

Target
cylinder charge for application calibration purposes

ZKDRLSOL

Time constant
for drlsol-integrator

Variable

Description

B_MDMIN

Condition
flag: minimum achievable indicated torque reached

B_SA

Condition
flag: overrun fuel cut-off active

C_INI

ECU initialisation condition

DRLSOLF_W

Filtered
change in target cylinder charge

DRLSOL_W

Change in
target cylinder charge

ETALAB

Lambda
efficiency without intervention with respect to the optimum torque at lambda =
1